improves mimetype guessing, previously file.sub.something would not have an extension

src/auto_archiver/core/extractor.py

@@ -80,8 +80,8 @@ class Extractor(BaseModule):
             d.raise_for_status()
 
             # get mimetype from the response headers
-            if not Path(to_filename).suffix:
-                content_type = d.headers.get('Content-Type')
+            if not mimetypes.guess_type(to_filename)[0]:
+                content_type = d.headers.get('Content-Type') or self._guess_file_type(url)
                 extension = mimetypes.guess_extension(content_type)
                 if extension:
                     to_filename += extension

src/auto_archiver/modules/html_formatter/html_formatter.py

@@ -9,7 +9,6 @@ import base64
 from auto_archiver.version import __version__
 from auto_archiver.core import Metadata, Media
 from auto_archiver.core import Formatter
-from auto_archiver.modules.hash_enricher import HashEnricher
 from auto_archiver.utils.misc import random_str
 from auto_archiver.core.module import get_module